온실가스 저감을 위한 이산화탄소 개질반응에서 귀금속(Rh, Pd)을 담지한 금속산화물 촉매상에 침적된 탄소의 종류

서호준 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-

Carbon species deposited on noble metals(Rh(5), Pd(5)) supported metal oxide(La_(2)O_(3), Al_(2)O_(3)) catalyst in Carbon Dioxide Reforming(CDR) reaction were discussed based on the experimental observations in a fixed bed flow reactor at atmospheric condition and also on analysis results by SEM and FT-IR. The wisker type carbon was deposited on the Rh(5)/La_(2)O_(3) and Rh(5)/Ce(1)/Al_(2)O_(3) catalyst, but carbon nanotubes was produced on the Rh(5)/Al_(2)O_(3) catalyst. CDR reaction over Rh(5)/Al_(2)O_(3) and Pb(5)/Al_(2)O_(3) catalyst was suggested to be a method among the carbon nanotubes preparation method.

불확실한 비선형 시스템에 대한 퍼지 관측기 설계

서호준,김동식 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.1

In the adaptive fuzzy sliding mode control, from a set of a fuzzy IF-THEN rules adaptive fuzzy sliding mode control whose parameters are adjusted on-line according to some adaption laws is constructed for the purpose of controlling the plant to track a desired trajectory. Most of the research works in nonlinear controller design using fuzzy systems consider the affine system with fixed grid-rule structure based on system state availability. The fixed grid-rule structure makes the order of the controller big unnecessarily, hence the on-line fuzzy rule structure and fuzzy observer based adaptive fuzzy sliding mode controller is proposed to solve system state availability problems. Therefor, adaptive laws of fuzzy parameters for state observer and fuzzy rule structure are established implying whole system stability in the sense of Lyapunov.

균일상과 불균일상에서 이산화탄소의 수소화반응

서호준 여수대학교 산업기술지역개발연구소 2000 産業基術硏究所 論文集 Vol.9 No.-

Hydrogenation of carbon dioxide by hydrogen was investigated on the basis of the product distribution of homogeneous and heterogeneous reaction in a fixed bed flow reactor. The main product of the both reaction was methane. The heterogeneous reaction using Pd(5wt%)Al□O□ catalyst was excellent, and produced methane of 82.03% yield at 800°C. However, the homogeneous reaction produced poor methane of 0.0046% yield at 800°C. XRD analysis showed that the active site of the catalyst was Pd(2 2 0) phase.

로듐(Rh)이 담지된 금속산화물 촉매상에서 합성가스 제조를 위한 이산화탄소 개질반응

서호준 여수대학교 2001 論文集 Vol.16 No.-

The effect of carrier in reforming of carbon dioxide to syngas over Rh(5wt%) promoted metal oxide(SiO_2, MgO, La_2O_3, TiO_2, Al-MCM-41)catalysts is discussed based on the experimental observations in a fixed bed flow reactor at atmospheric condition and SEM, XRD analysis. Catalyst activity depends on the carrier employed, and activity sequence of carrier promoted Rh(5wt%) after 8.6 hr is La_2O_3 > SiO_2 > MgO ≫Al-MCM-41 ?? TiO_2. The good activity of Rh(5wt%)/La_2O_3 catalyst seems to depend on the perovskite oxide, LaRhO_3(2 2 0 ; 3 1 0) or/and LaRh(1 3 1 ; 1 3 2) crystalline phases. Adding oxygen, 1.2 mlO_2/min to reactant contributes to eleminate carbon on Rh(5wt%)/La_2O_3 catalyst surface.

Ni/Ti0₂ 촉매상에서 CO₂ 개질 반응에 있어서 조촉매 및 Ni 담지량의 영향

서호준,유의연 全南大學校 觸媒硏究所 1996 觸媒硏究 論文集 Vol.18 No.-

The effect of Ni loading andition of promoters such as KCI, NaCl, CaO and MgO was studied on the CO₂reforming over Ni/TiO₂catalysts in a fixed bed flow reactor at atmospheric pressure. 10wt% Ni loaded catalyst showed optimum activity. The effect of promoters on the catalytic activity was Ca>Mg>K>Na in order. Adding promoter could be suggested that the reverse Boudouard reaction occur.

Mg-Oxide에 담지된 알칼리 금속염 촉매상에서 메탄의 Oxidative Coupling 반응에 관한 연구

서호준 麗水水産大學校 産業技術硏究所 1995 産業基術硏究所 論文集 Vol.4 No.-

OCM(Oxidative Coupling of Methane) is discussed based on experimental observations in a fixed bed flow reactor at atmospheric condition and instrumental analyses such as FT-IR, SEM, etc. Among the alkali metal salts impregnated Mg-Oxide catalysts, the bialkali metal salts impregnated Mg-Oxide catalyst showed superior activity to monoalkali metal salts impregnated Mg-Oxide catalysts based on the C₂ yield. Activity order of alkali metal salts impregnated Mg-Oxide catalysts based on the C₂ yield was [LiCl+NaCl] 〉 LiCl 〉 NaCl 〉 KCl. This suggests bialkali metal salts to neutralize the acid site through the production of superbasicity due to synergic effect. Moreover, the production distribution of OCM over alkali metal salts impregnated Mg-Oxide catalysts shows that a competitive primary reaction of methane to C₂ or CO? has occured. Ethylene is proposed to secondary reaction of ethane.

흉·요추부 압박골절에 대한 수술 전후의 3차원 영상진단상의 변화에 대한 비교 분석

박한준,김영태,서면,하호균 대한신경외과학회 1997 Journal of Korean neurosurgical society Vol.26 No.6

연료 변화에 따른 고압 스월 인젝터의 연료분무 특성

李珉湖,李焌瑞,車京玉 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

In comparison with gasoline engine, LPG direct injection engine can have advantage in emission and fuel efficiency, and solve the problems which conventional LPG engine has, like power decrease and back fire etc. So, Direct injection engine technology is applied to LPG engine, it can show the solution of ULEV emission regulation. In this paper, the in-cylinder spray characteristics of LPG fuel has been studied in the CVC as a preliminary research for the development of low emission and high fuel efficiency of LPG engine in near future. During the direct injection of LPG fuel into the inside of CVC, both droplet development and vaporization characteristics according to the injection condition have been photographed by the high speed shadow graph and schlieren methods. The results are compared with the case of gasoline fuel.

Formocresol pulpotomy와 연관된 함치성 낭종의 시험례

주태준,박호원,이주현,서현우 大韓小兒齒科學會 2009 大韓小兒齒科學會誌 Vol.36 No.3

1904년 Buckley에 의해 치근관 살균제로 도입된 이후로 1:5로 희석된 formocresol을 사용한 치수절단술이 치아우식에 의한 유치의 비가역적 치수염시에 가장 많이 사용되어 왔다. Formocresol은 치수조직의 높은 고정능력으로 높은 임상적 성공률을 보이고 있으나 자체독성이 매우 강하여 영구 계승치 치배의 변위나 결손, 법랑질 형성 부전, 전신흡수로 인한 돌연변이 가능성과 암유발 가능성 역시 보고되고 있다. 또한 formocresol을 사용한 치수절단술 후에 과사용된 formocresol에 의한 만성적인 염증이 계승 영구치로 확산되어 퇴축법랑상피의 증식을 자극하고 법랑질로부터 퇴축법랑상피를 분리시켜 함치성 낭종을 형성할 수 있음이 보고되고 있다. 본 증례는 3년 전 응급으로 하악 좌측 제 2유구치의 formocresol을 사용한 치수절단술 후 정기 검진을 위해 내원한 환자의 방사선 사진에서 함치성 낭종이 발견되어 낭종 제거와 함께 유치의 발치를 시행했고 발치된 유치에서 formocresol cotton pellet이 제거되지 않은 채로 발견되어 formocresol이 장기간 남아있음으로 인해 낭종을 형성할 수 있음을 보고하는 바이다. Buckley's formocresol was first introduced as a pulp medicament in 1904, and since 1930, it has been the treatment of choice for primary molar pulpotomies. Formocresol has fixation effect of pulp tissue and high clinical success rate. But side effect such as displacement and loss of permanent successor, amelogenesis imperfecta, cyst formation, mutation by general absorption, possibility of cancer induction have been reported. Of those, dentigerous cyst can form in the periradicular region after formocresol pulpotomy caused by an alteration of the reduced enamel epithelium, which result in fluid accumulation between the epithelium and the tooth crown. The present case describes a 6-year-old girl who had accidentally discovered in the panoramic radiograph a single, well-defined, radioluscent area enclosing the second unerupted mandibular premolar. The second left primary molar had been pulpotomizied 3 year before. Surgical treatment was carried out, the primary molar was extracted and cystectomy was performed under local anesthesia. In the extracted second primary molar, formocresol cotton pellet was left in the pulp chamber. Histologic study confirmed the suspected diagnosis of dentigerous cyst. This report present a case of dentigerous cyst associated with inadequate formocresol pulpotomized deciduous molar.

못총에 의한 두부총상의 뇌정위적 수술 치험례 : 증례보고 Case Report

박한준,김영태,서면,하호균 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.9

The authous report a rare case of gunshot injury to the head by a nail-gun which was treated by stereotactic surgery. In the case a 23-year-old male patient, presented with semicomatose mentality and decerebrated rigidity. The large nail was located in the 3rd ventricular area in the mid-line with vertical stature. The entry point was identified 1㎝ anterior to the coronal suture line and just lateral to the sagittal suture line. The foreign body was removed stereotactically with the guidance of fluoroscope. But he died of initial severe brain damage.